JPS59149240A - Rest-amount indicator for business sheet - Google Patents

Abstract

PURPOSE:To prevent suspension of work due to exhaustion of a business sheet by detecting the rest amount of the businness sheet by a strain gauge installed onto a pressing spring whose deflection amount is varied according to the drawing out of the business sheet. CONSTITUTION:A business-sheet 4 set into a business-sheet setting case 2 is pressed onto a feed roller as business-sheet drawing-out means, by applying pressure from the lower part onto the business-sheet setting case 2 by a pressing spring 3, and a feeding pressure is generated. The output of a strain gauge 5 installed onto the pressing spring 3 is supplied into a bridge circuit 6 and applied into an indicator 8 through an amplifying circuit 8, and the rest amount is shown outside.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper remaining amount display device that displays the remaining amount of paper stored in a paper storage case of a copying machine or the like.

In copying machines and the like, a paper storage case can store up to a predetermined amount of paper, and when the paper is fed out each time it is used and the paper runs out, the operator replenishes the paper as appropriate.

However, when cutting a large amount of paper continuously, for example when making a large number of copies using a copying machine, the operator must check the amount of paper in the paper storage case each time. If you want to make a large number of copies in a hurry because you don't know, and you start the copying operation when there is only a small amount of paper left, you may run out of paper during the copying operation. There is a problem in that the process is interrupted, and the operator is required to perform operations such as replenishing paper in the middle, which is very bothersome to the operator.

The present invention has been made in view of the above points, and provides a paper remaining amount display device that allows the remaining amount of paper to be easily confirmed in advance and prevents interruption of work due to paper shortage as described above. The purpose is to provide

Hereinafter, one embodiment of the present invention will be described based on the drawings.

The figure shows an embodiment of this crystallized paper remaining amount display device, and shows an example of a cross section and an electric circuit of the case when applied to a paper storage case of a photographing machine.

In the figure, (1) is the cassette booth, (2) is the paper set case, (8) is the plate-shaped pressure spring attached to the cassette case (1), and this pressure splash (3) By applying pressure to the paper set case (2) from below, the paper (4) set in the paper set case (2) is brought into pressure contact with a feed roll (not shown) serving as a paper feeding means. to generate feed pressure. (5) is a strain gauge attached to the pressure spring (3) to detect the amount of deflection of the pressure spring (3), and this strain gauge (5) is used as the paper (4) is fed out. Accordingly, the amount of deformation of the pressure spring (3) upward in the figure is detected.

In the illustrated circuit example, the output of the strain gauge (5) is supplied to a bridge circuit (6), and the output of the bridge circuit (6) is passed through an amplifier circuit (7) to a display device (8). ), and the remaining amount of paper is now displayed externally. The display device (8) may be placed, for example, on the operation panel of the copying machine so that the operator can easily view it from the outside.

According to the device with the above configuration, the pressure spring (3) is attached to the paper (4).
Since the amount of deflection changes depending on its own weight and its loading height, the output of the strain gauge (5) will also change accordingly. Also, since the weight and height of paper (4-) are proportional to the remaining amount of paper (4), the output of the strain gauge (5) is
) will change as the remaining amount changes. Therefore, the output of the strain gauge (5) is input to the above-mentioned electric circuit, converted into voltage or current by the bridge circuit (6), and then converted to voltage or current by the bridge circuit (6).
) to drive the display device (8),
The remaining amount of paper at that time can be displayed externally as, for example, approximately 70 sheets in the illustrated example.

In this way, when the paper (4) is pressed against the feed roll, the strain gauge (5) is applied to the pressure spring (3) that generates the feed pressure.
), and the pressure splash (3) is pasted by this strain gauge (5).
) The remaining amount of paper can be detected by detecting the amount of deformation, and the result can be displayed externally. Therefore, when making a large number of copies using a copying machine, the operator does not have to check the amount of paper remaining in the paper storage case each time, and can easily check the amount of paper remaining in advance. This eliminates the inconvenience of starting copying work in a situation where □ occurs, and it is possible to prevent copying work from being interrupted due to running out of paper. In the above embodiment, the case of a copying machine is taken as an example, but the present invention is not limited thereto, and can be applied to, for example, a paper storage case of an electronic printing machine.

As described above, the present invention allows the remaining amount of paper to be easily confirmed from the outside in advance, thereby preventing interruptions in work due to running out of paper. This has the effect of not making you feel very bothered.

[Brief explanation of drawings]

The figure is a configuration diagram showing the configuration of an embodiment of the remaining paper amount display device of the present invention.

Claims (1)

[Claims] A pressure spring whose deflection amount changes as the paper is fed out, a strain gauge installed on this pressure spring, and the output of this strain gauge to detect the remaining amount of paper and display the remaining paper amount. A paper remaining amount display device characterized by comprising a circuit for: